////////////////////////////////////////////////////////////
//
// SFML - Simple and Fast Multimedia Library
// Copyright (C) 2007-2023 Laurent Gomila (laurent@sfml-dev.org)
//
// This software is provided 'as-is', without any express or implied warranty.
// In no event will the authors be held liable for any damages arising from the use of this software.
//
// Permission is granted to anyone to use this software for any purpose,
// including commercial applications, and to alter it and redistribute it freely,
// subject to the following restrictions:
//
// 1. The origin of this software must not be misrepresented;
//    you must not claim that you wrote the original software.
//    If you use this software in a product, an acknowledgment
//    in the product documentation would be appreciated but is not required.
//
// 2. Altered source versions must be plainly marked as such,
//    and must not be misrepresented as being the original software.
//
// 3. This notice may not be removed or altered from any source distribution.
//
////////////////////////////////////////////////////////////

////////////////////////////////////////////////////////////
// Headers
////////////////////////////////////////////////////////////
#include <SFML/Audio/AlResource.hpp>
#include <SFML/Audio/AudioDevice.hpp>

#include <memory>
#include <mutex>


namespace
{
// OpenAL resources counter and its mutex
unsigned int         count = 0;
std::recursive_mutex mutex;

// The audio device is instantiated on demand rather than at global startup,
// which solves a lot of weird crashes and errors.
// It is destroyed when it is no longer needed.
std::unique_ptr<sf::priv::AudioDevice> globalDevice;
} // namespace


namespace sf
{
////////////////////////////////////////////////////////////
AlResource::AlResource()
{
    // Protect from concurrent access
    const std::lock_guard lock(mutex);

    // If this is the very first resource, trigger the global device initialization
    if (count == 0)
        globalDevice = std::make_unique<priv::AudioDevice>();

    // Increment the resources counter
    ++count;
}


////////////////////////////////////////////////////////////
AlResource::~AlResource()
{
    // Protect from concurrent access
    const std::lock_guard lock(mutex);

    // Decrement the resources counter
    --count;

    // If there's no more resource alive, we can destroy the device
    if (count == 0)
        globalDevice.reset();
}

} // namespace sf
